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Re: [Acme] Issuing certificates based on Simple HTTP challenges

Julian Dropmann <julian@dropmann.org> Mon, 14 December 2015 17:04 UTC

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Date: Mon, 14 Dec 2015 18:03:55 +0100
Message-ID: <CAF+SmEoxjAtaa6D=cLRs-LtmztH63jCx=MuhYTAvEFHaTjb5vg@mail.gmail.com>
From: Julian Dropmann <julian@dropmann.org>
To: Acme@ietf.org
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Subject: Re: [Acme] Issuing certificates based on Simple HTTP challenges
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On Mon, Dec 14, 2015 at 5:58 PM, moparisthebest <admin@moparisthebest.com>
wrote:

> On 12/14/2015 11:53 AM, Julian Dropmann wrote:
> >
> >     >This effectively means, as a domain zone admin, I have to trust
> every single service I define, not just to properly deliver this service,
> but also not to exploit his ability to obtain signed certificates in my
> name.
> >
> >     Yes.
> >
> >
> > And you are perfectly aware, that this was not the case before
> > ACME-enabled CAs existed, and now applies to every single domain admin
> > on this planet, right?
>
> It always applied before as well.  In your example, your malicious blog
> hoster could have just hosted un-encrypted xmpp on the default port as
> well and xmpp clients that don't support SRV (which probably don't
> exist? it's in the original RFC) would just happily connect there as
> well, right?
>

Sure, they were able to provide malicious services under that domain, but
not with a valid certificate.
I think this is still a major difference.

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